CVE-2026-92598
Nodemailer before 9.1.0 IDN/Punycode Domain Allow-list Bypass
- State
- Published
- Severity
- 8.3 High
- Published
- Sep 16, 2026
- Updated
- Sep 17, 2026
- Reserved
- Sep 16, 2026
Description
Nodemailer before 9.1.0 fails to apply UTS-46 normalization when encoding international domain names, causing the domain resolver to compute a different Punycode A-label than standards-compliant parsers. Attackers can craft recipient addresses with invisible characters or compatibility mappings that pass domain allow-list checks but are delivered to attacker-controlled domains via SMTP.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.3 High | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N | VulnCheck |
Weaknesses
- CWE-436 Interpretation Conflict
Affected Products
| Product | Versions |
|---|---|
nodemailernodemailer |
|
References
- GitHub Security Advisory (GHSA-wmmp-3585-3rmp)vendor-advisory
- Patch Commitpatch
- Patch Commitpatch
- VulnCheck Advisory: Nodemailer before 9.1.0 IDN/Punycode Domain Allow-list Bypassthird-party-advisory
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